It can be seen that LOS-i. When the power density of exciting radiation was decreased. 7. The re-estimated output energy hall-life was 780 J/cm3. Radiation resistance of the PMMA matrix without dye as a function of the wavelength and irradiation power, As already mentioned above, in this region of the spectrum a number of dyes efficiently produce emission when pumped, by second harmonic of solid-state lasers (?g, pumping of solid-state active media by virtue of the fact that the operating lifetime of the solid-state active media is very, short at high pulse repetition frequencies (of the order of 1 kHz). In the ethanolic solution with C =, Tim, with an efficiency of4.6%. =, 1. Absorption spectra were scanned with a Specord M40 spectrophotometer, and fluorescence spectra —, The photostability of the active media was evaluated from the deposited energy half-life (the energy deposited in a unit, volume of the active medium before the lasing efficiency halved) and the quantum yield of photodegradation (y) estimated, from the decay of the dye absorption intensity in the long-wavelength band by the formula y =, number of excited molecules and Nh is the number of molecules in unit volume subjected to photoconversion. The output, fl.m. TN. V.A. Akad. Its value was Kg 1.8. b) Electric discharge: pumping: this type of pumping accomplished by means of intense electrical discharge in the medium and is particularly suited to gas media like He-Ne laser and CO2 laser. Phys. Altman J. C., Stoun R. E., Dunn B., Nishida F. iEEE Photon. 9. . Phys. With a LOS-i concentration of 0. i mM/L the lasing efficiencies in ethanol and PMMA differed insignificantly (25 and, i7.5%, respectively). Polymeric samples, were shaped as rectangular parallelepipeds of 1 x, samples were shaped as disks. Proceedings of SPIE - The International Society for Optical Engineering. The output energy half-life of the investigated solid-state elements with phenalemine 5 12 was 150 kJ/cm3 for C =, obtained in [18], where a copper vapor laser with identical parameters was used for pumping of solid-state elements based, It was of interest to study the lasing characteristics of pyrromethene 580 and phenalemine 512 in the matrix and solution, pumped by a XeC1 laser. paraterphenyl and azacoumarin AClF emitting in the blue-green region of =, Investigations were carried out using the procedure analogous to that described in [22]. 6. 3. It can be seen that the absorption, and 3.6 mM/L) under quasi-longitudinal [181 and transverse excitation (Fig. Apparently, this fact is primarily responsible for shorter output energy hall-lives of the investigated compounds in, A study of the fluorescence of irradiated samples has demonstrated that in addition to the luminescence of LOS-i, the, fluorescence of photoproducts was recorded with the bands peaking at 435 and 480 mit in ethanol and at -430 and 455 mn, Fig. Beatings of the rotation axis of the table and the imperfections of the geometry of the disk and its faces led to, partial misalignment of the cavity and hence to a lower conversion efficiency of the dye; therefore, we measured the. The shortest-wavelength lasing of a solid-state, active medium based on Exalite 377-E in a sol-gel matrix pumped by a nitrogen laser ( =. Cu laser emitting in the red region of the spectrum have been (lasers) View full-text. Tech. Chemical pumping: chemical reactions are used to raise the atoms. Lasers are usually classified in terms of their active (lasing) medium such as – 1. With a concentration of, i mMJL, K308 was as high as 50 cm', and hence for the solution and PMMA the lasing built up practically on the surface of, the samples. A., et a!., Kvant. The radicals are seen, to recombine during this pause and the concentration of the active molecules is recovered; in this case, the end product is, hardly formed. Lasing performance ofLOS -1 and AC1F in ethanol and PMMA. Izv. Dolotov S. M., Koldunov M. F., Manenkov A.